eclipes tips

显示行号和打印边界
v3.0.2
Window->preferences->java->Editor->appearances->show line numbers.
Window->preferences->java->Editor->appearances->show print margin.

v3.1
window->preferences->general->editors->text editors

"workspace in use " 怎么办?
    一般来说这是由于eclipse被强行中止所致, 删除workspace/.metadata/.lock文件就可以了.你可以通过workspace/.metadata/.log查看运行时出了什么问题.

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